Re: [Matplotlib-users] matshow unequal element sizes

[Michael D. <md...@st...>]

By default (when interpolation="nearest") matplotlib is performing 
nearest neighbor interpolation on the image to the request PDF dpi 
before storing it in the file.  This results in rows and columns of 
unequal size because the ratio from the original image to the 
destination resolution is likely not integral.

You can set interpolation="none", which will pass the original image 
as-is on to the file, but then we can't control the interpolation mode 
(since there's no way to tell the PDF viewer what sort of interpolation 
to perform), so that (usually) will result in bicubic interpolation, 
which is probably not what you want.

Mike

On 06/06/2013 05:52 AM, Michiel de Hoon wrote:
> Hi all,
>
> I am trying to draw a heatmap using matshow, which I then save as a PDF.
> If I then zoom in in the PDF, I notice that different rows have different sizes, and different columns have different sizes. It seems that some rows/columns have twice the height/width as other rows/columns.
> Attached is a screenshot of part of the PDF after zooming in.
> Is there some way to force all rows / columns to have the same height/width?
>
> Best,
> -Michiel.
>
>
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